Is this something that she should be concerned about?. The blue spot is larger than a mole, sometimes it is about 2 inches, but after a week or 2 this goes away. The blue mark could appear on the arm where the blood was taken, but there was time where it appeared on her leg. l would appreciate if anyone who knows any information about this condition can share it with me. Thanks everyone.
Thank you for all the . l am glad it is not something serious. Thanks guys.

That is normal for most people. It is just a bruise caused by the needle. no need to worry

It is called a hematoma and it is normal. It is just a little blood that came out from the injection site and caused a bruise-like appearance.

It is a bruise. From blood leaking under the skin from the punctured vein. It goes away in a few days.

Good lord, people do walk around in the dark.